What causes blood in dogs

There are many reasons why dogs generally pull blood, the common ones are: 1. food factors, may be unhygienic, may also be poor digestion, etc. 2. enteritis, acute enteritis will also lead to pulling blood. 3. parasites, generally there are worms in the belly will also pull blood. 4. viral disease, incomplete vaccines or no vaccine when the love more frequent. 5. foreign body, ate sharp things (bones, etc.).